Code cleanup and TYPO fix under JVET_AD0208_IBC_ADAPT_FOR_CAM_CAPTURED_CONTENTS

Merged Chun-Chi Chen requested to merge chunchic/ecm-4:JVET-AD0208-CodeCleanUp+FixTypo into master

Clean up unused code and fix a TYPO under the macro JVET_AD0208_IBC_ADAPT_FOR_CAM_CAPTURED_CONTENTS.

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